Patent Knotting

Product Description

Coo-Var Patent Knotting is a low viscosity shellac based product. Use on knotted or resinous wood to prevent staining of future paint films.

As with all paint products please read the technical datasheet before use. If you have any questions or need technical advice we are here to help please call 01482 328053 or email info@coo-var.co.uk.

Patent Knotting FAQ's

What is patent knotting?

Patent knotting, also known as knotting solution or knot sealer, is a shellac-based solution used to seal knots in wood. It prevents the resin or sap from bleeding through the paint or varnish, ensuring a smooth and blemish-free finish.

Why do I need to use patent knotting on wood knots?

Wood knots can exude resin or sap over time, which can bleed through paint or varnish, causing discoloration and imperfections. Using patent knotting seals the knots, preventing this bleed-through and ensuring a long-lasting, clean finish.

How do I apply patent knotting?

1. Surface preparation: Ensure the wood surface is clean, dry, and free from dust and grease.
2. Application: Apply the patent knotting directly onto the knots using a brush. Ensure the knots are fully covered.
3. Drying: Allow the solution to dry thoroughly, following the manufacturer's recommended drying time.
4. Multiple coats: For best results, apply two to three coats, allowing each coat to dry before applying the next.

How long does patent knotting take to dry?

Drying times can vary depending on the specific product and environmental conditions. Generally, patent knotting dries within 30 minutes to an hour. However, it's best to wait a few hours before sanding or applying additional coats.

Can I use patent knotting on all types of wood?

Patent knotting can be used on most types of wood that have visible knots. It's particularly useful on softwoods like pine, which often have resinous knots.

Is patent knotting necessary for all woodworking projects?

Using patent knotting is especially important for projects where a flawless finish is desired, such as furniture, trim, and paneling. For rougher or less visible woodwork, it might not be as critical.

Can patent knotting be used under all types of paint and varnish?

Yes, patent knotting can be used under most types of paint and varnish. However, it's always a good idea to check the compatibility with the specific topcoat you plan to use by doing a small test.

How does patent knotting differ from other wood sealers or primers?

Patent knotting is specifically designed to seal resinous knots, whereas other wood sealers or primers may not provide the same level of protection against bleed-through. It is formulated to penetrate and seal knots effectively, providing a barrier against resin seepage.

Are there any safety precautions I should take when using patent knotting?

• Ventilation: Use in a well-ventilated area to avoid inhaling fumes.
• Protective gear: Wear gloves and eye protection to avoid skin and eye contact.
• Fire safety: Patent knotting solutions are flammable, so keep them away from open flames and heat sources.

Can I apply patent knotting over previously painted or varnished surfaces?

Patent knotting is designed to be used on bare wood. If the surface is already painted or varnished, it may not penetrate properly. It’s best to remove any existing finish from the knots before applying the knotting solution.

How can I ensure the best results with patent knotting?

• Clean surface: Ensure the wood surface is clean and dry.
• Proper application: Apply evenly and thoroughly, covering all knots.
• Multiple coats: Apply two to three coats for maximum effectiveness.
• Drying time: Allow adequate drying t

Technical Information

• PATENT KNOT DATA TDS CV.PDF

• 317/V604 - PATENT KNOTTING

Delivery

Standard delivery 48 to 72 hours (business hours). Prices are excluding VAT.

*Please note that these prices only apply for UK Mainland and the Islands above.

If in doubt please call 01482 328052 or email info@coo-var.co.uk​